>> >> Or the engineer means that in legacy PIC mode the IRQs are shared, but>> in APIC mode they can be separated. That is a different thing, cause in>> that case the IRQ lines are not physically connected, but put together>> in PIC mode and can again be separated by using APIC mode.>> Ah, you could be right here. In the BIOS, there an option to> enable/disable APIC, which corresponds to what you are suggesting> above.>PlusCONFIG_X86_UP_APIC=yCONFIG_X86_UP_IOAPIC=yCONFIG_X86_LOCAL_APIC=yCONFIG_X86_IO_APIC=y